May learn from a book written from the author's experience, or learn from the experience of others and be used as a guide to create your own experience.
Could be learned from a book written by the author's experience, or may be learned from the experience of others and then used as a guide to create their own experience.
May learn from books written from the experience of the author, or may learn from the ประสบการณ์ตรง of others and used as a guideline to create my own experience